refactor: break up app.js into smaller modules

Split static/js/app.js (581 lines) into 5 focused modules:
- utils.js: global utilities store + legacy compat
- components.js: reusable Alpine.js components (copy, confirm, dismiss, time)
- app-detail.js: app detail page logic (status polling, logs)
- deployment.js: deployment card + deployments history page
- dashboard.js: dashboard relative time updates

Closes #128

static/js/utils.js

@@ -0,0 +1,143 @@
+/**
+ * upaas - Global Utilities Store
+ *
+ * Shared formatting, status helpers, and clipboard utilities used across all pages.
+ */
+
+document.addEventListener("alpine:init", () => {
+  Alpine.store("utils", {
+    /**
+     * Format a date string as relative time (e.g., "5 minutes ago")
+     */
+    formatRelativeTime(dateStr) {
+      if (!dateStr) return "";
+      const date = new Date(dateStr);
+      const now = new Date();
+      const diffMs = now - date;
+      const diffSec = Math.floor(diffMs / 1000);
+      const diffMin = Math.floor(diffSec / 60);
+      const diffHour = Math.floor(diffMin / 60);
+      const diffDay = Math.floor(diffHour / 24);
+
+      if (diffSec < 60) return "just now";
+      if (diffMin < 60)
+        return diffMin + (diffMin === 1 ? " minute ago" : " minutes ago");
+      if (diffHour < 24)
+        return diffHour + (diffHour === 1 ? " hour ago" : " hours ago");
+      if (diffDay < 7)
+        return diffDay + (diffDay === 1 ? " day ago" : " days ago");
+      return date.toLocaleDateString();
+    },
+
+    /**
+     * Get the badge class for a given status
+     */
+    statusBadgeClass(status) {
+      if (status === "running" || status === "success") return "badge-success";
+      if (status === "building" || status === "deploying")
+        return "badge-warning";
+      if (status === "failed" || status === "error") return "badge-error";
+      return "badge-neutral";
+    },
+
+    /**
+     * Format status for display (capitalize first letter)
+     */
+    statusLabel(status) {
+      if (!status) return "";
+      return status.charAt(0).toUpperCase() + status.slice(1);
+    },
+
+    /**
+     * Check if status indicates active deployment
+     */
+    isDeploying(status) {
+      return status === "building" || status === "deploying";
+    },
+
+    /**
+     * Scroll an element to the bottom
+     */
+    scrollToBottom(el) {
+      if (el) {
+        requestAnimationFrame(() => {
+          el.scrollTop = el.scrollHeight;
+        });
+      }
+    },
+
+    /**
+     * Check if a scrollable element is at (or near) the bottom.
+     * Tolerance of 30px accounts for rounding and partial lines.
+     */
+    isScrolledToBottom(el, tolerance = 30) {
+      if (!el) return true;
+      return el.scrollHeight - el.scrollTop - el.clientHeight <= tolerance;
+    },
+
+    /**
+     * Copy text to clipboard
+     */
+    async copyToClipboard(text, button) {
+      try {
+        await navigator.clipboard.writeText(text);
+        return true;
+      } catch (err) {
+        // Fallback for older browsers
+        const textArea = document.createElement("textarea");
+        textArea.value = text;
+        textArea.style.position = "fixed";
+        textArea.style.left = "-9999px";
+        document.body.appendChild(textArea);
+        textArea.select();
+        try {
+          document.execCommand("copy");
+          document.body.removeChild(textArea);
+          return true;
+        } catch (e) {
+          document.body.removeChild(textArea);
+          return false;
+        }
+      }
+    },
+  });
+});
+
+// ============================================
+// Legacy support - expose utilities globally
+// ============================================
+window.upaas = {
+  // These are kept for backwards compatibility but templates should use Alpine.js
+  formatRelativeTime(dateStr) {
+    if (!dateStr) return "";
+    const date = new Date(dateStr);
+    const now = new Date();
+    const diffMs = now - date;
+    const diffSec = Math.floor(diffMs / 1000);
+    const diffMin = Math.floor(diffSec / 60);
+    const diffHour = Math.floor(diffMin / 60);
+    const diffDay = Math.floor(diffHour / 24);
+
+    if (diffSec < 60) return "just now";
+    if (diffMin < 60)
+      return diffMin + (diffMin === 1 ? " minute ago" : " minutes ago");
+    if (diffHour < 24)
+      return diffHour + (diffHour === 1 ? " hour ago" : " hours ago");
+    if (diffDay < 7)
+      return diffDay + (diffDay === 1 ? " day ago" : " days ago");
+    return date.toLocaleDateString();
+  },
+  // Placeholder functions - templates should migrate to Alpine.js
+  initAppDetailPage() {},
+  initDeploymentsPage() {},
+};
+
+// Update relative times on page load for non-Alpine elements
+document.addEventListener("DOMContentLoaded", () => {
+  document.querySelectorAll(".relative-time[data-time]").forEach((el) => {
+    const time = el.getAttribute("data-time");
+    if (time) {
+      el.textContent = window.upaas.formatRelativeTime(time);
+    }
+  });
+});